$\frac{\sin\left(x\right)}{1-cosx}$
$2x^2+5x=0$
$4x\:-\:3y\:+\:23y$
$\frac{\left(-10x^2y^3+5x^2y^4+x^3y^3z\right)}{2xy^2}$
$\frac{700}{2}$
$-x^3+7x^2+12x-54$
$-17\left(-8\right)$
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